public class EquivalenceComparison extends BinaryExpression implements ComparisonExpression
operand0, operand1, operatorEFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, EVENT_FEED_METHOD, INHERITED_CONTEXT, INSPECTION_CONTEXT, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, NAVIGATION_CONTEXT, NODE_VALUE_CONTEXT, PROCESS_METHOD, PUSH_SELECTION, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, W3C_CONSUMING, W3C_FREE_RANGING, W3C_GROUP_CONSUMING, W3C_MOTIONLESS, WATCH_METHOD| Constructor and Description |
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EquivalenceComparison(Expression p1,
int operator,
Expression p2)
Create a singleton comparison - that is, a comparison between two singleton (0:1) sequences
using the general comparison semantics
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| Modifier and Type | Method and Description |
|---|---|
int |
computeCardinality()
Determine the static cardinality.
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boolean |
convertsUntypedToOther()
Determine whether untyped atomic values should be converted to the type of the other operand
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Expression |
copy()
Copy an expression.
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boolean |
effectiveBooleanValue(XPathContext context)
Evaluate the expression in a boolean context
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BooleanValue |
evaluateItem(XPathContext context)
Evaluate the expression in a given context
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protected void |
explainExtraAttributes(ExpressionPresenter out)
Add subclass-specific attributes to the expression tree explanation.
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AtomicComparer |
getAtomicComparer()
Get the AtomicComparer used to compare atomic values.
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AtomicComparer |
getComparer() |
ExpressionCompiler |
getExpressionCompiler()
Return the compiler of the EquivalenceComparison expression
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ItemType |
getItemType(TypeHierarchy th)
Determine the data type of the expression
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int |
getSingletonOperator()
Get the primitive (singleton) operator used: one of Token.FEQ, Token.FNE, Token.FLT, Token.FGT,
Token.FLE, Token.FGE
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boolean |
isKnownToBeComparable() |
Expression |
typeCheck(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Type-check the expression.
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computeSpecialProperties, displayOperator, equals, explain, getArguments, getOperands, getOperator, hashCode, isAssociative, isCommutative, isInverse, iterateSubExpressionInfo, iterateSubExpressions, optimize, promote, replaceSubExpression, setFlattened, simplify, toStringaddToPathMap, adoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, evaluateAsString, evaluatePendingUpdates, explain, getCardinality, getColumnNumber, getColumnNumber, getConstructType, getContainer, getDependencies, getEvaluationMethod, getExecutable, getExpressionName, getHostLanguage, getImplementationMethod, getIntegerBounds, getIntrinsicDependencies, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getObjectName, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getStreamability, getStreamingAdjunct, getSystemId, getSystemId, hasVariableBinding, implementsStaticTypeCheck, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, iterate, iterateEvents, markTailFunctionCalls, process, resetLocalStaticProperties, setContainer, setEvaluationMethod, setFiltered, setLocationId, staticTypeCheck, suppressValidation, toPattern, toStreamingPattern, typeErrorclone, finalize, getClass, notify, notifyAll, wait, wait, waitgetOperandspublic EquivalenceComparison(Expression p1, int operator, Expression p2)
p1 - the first operandoperator - the operatorp2 - the second operandpublic Expression typeCheck(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
typeCheck in class BinaryExpressionvisitor - an expression visitorcontextItemType - the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPEXPathException - if an error is discovered during this phase
(typically a type error)public AtomicComparer getAtomicComparer()
ComparisonExpressiongetAtomicComparer in interface ComparisonExpressionpublic int getSingletonOperator()
ComparisonExpressiongetSingletonOperator in interface ComparisonExpressionpublic boolean convertsUntypedToOther()
convertsUntypedToOther in interface ComparisonExpressionpublic int computeCardinality()
computeCardinality in class BinaryExpressionStaticProperty.ALLOWS_ZERO_OR_ONE,
StaticProperty.EXACTLY_ONE, StaticProperty.ALLOWS_ONE_OR_MORE,
StaticProperty.ALLOWS_ZERO_OR_MOREpublic ItemType getItemType(TypeHierarchy th)
getItemType in class Expressionth - the type hierarchy cachepublic boolean isKnownToBeComparable()
public AtomicComparer getComparer()
public Expression copy()
copy in class Expressionpublic BooleanValue evaluateItem(XPathContext context) throws XPathException
evaluateItem in class Expressioncontext - the given context for evaluationXPathException - if any dynamic error occurs evaluating the
expressionpublic boolean effectiveBooleanValue(XPathContext context) throws XPathException
effectiveBooleanValue in class Expressioncontext - the given context for evaluationXPathException - if any dynamic error occurs evaluating the
expressionpublic ExpressionCompiler getExpressionCompiler()
getExpressionCompiler in class Expressionprotected void explainExtraAttributes(ExpressionPresenter out)
BinaryExpressionexplainExtraAttributes in class BinaryExpressionout - the output destination for the displayed expression treeCopyright (c) 2004-2013 Saxonica Limited. All rights reserved.